Shield for fastener driving tool



Sept. 26, 1961 E. F. PFAFF 3,001,197

SHIELD FOR FASTENER DRIVING TOOL Filed June 11. 1956 3 Sheets-Sheet 1 vIN V EN TOR.

f/ er f. Pia f2" BY A #orneys Sept. 26, 1961 E. F. PFAFF 0 7 SHIELD FOR FASTENER DRIVING TOOL Filed June 11, 1956 '3 Sheets-Sheet 2 INVENTOR. [/mer E Pfa ff Sept. 26, 1961 E. F. PFAFF 3,001,197

SHIELD FOR FASTENER DRIVING TOOL Filed June 11 1956 3 Sheets-Sheet 3 Fi 1O INVENT E/mer E Pfa 3,001,197 SHIELD FOR FASTENER DRIVING TOOL Elmer F. Pfah, Mantua, Ohio, assignor, by mesne assignments, to ()lin Mathieson Chemical Corporation, a corporation of Virginia Filed June 11, 1956, Ser. No. 590,602 12 Claims. (Cl. 144.5)

This invention relates to improvements in a fastener driving tool and more particularly to the shield for said tool.

One of the objects of the present invention is to provide a shield having a resilient means for detachably gripping a workpiece projection, means for adjustably maintaining the distance between a fixed and a movable projection on a workpiece, means for maintaining this distance even though there may be variation in the size of the movable projection, guide spacer construction assuring parallel relationship between locating surfaces, foolproof lock action for guide spacer adjustment, and/or a plurality of workpiece projection receiving grooves so that the shield may be used in a plurality of difierent po sitions thereon.

A further object of the present invention is to provide a shield for a fastener driving tool characterized by its structural simplicity, many advantageous operating features, and strong and sturdy nature.

Other features of this invention reside in the arrange ment and design of the parts for carrying out their appropriate functions.

Other objects and advantages of this invention will be apparent from the accompanying drawings and description and the essential features will be set forth in the appended claims.

In the drawings,

FIG. 1 is a side elevational view of a fastener driving, powder actuated tool removed from the workpiece;

FIG. 2 is a top plan, enlarged view of the front portion of the tool in FIG. 1;

FIG. 3 is a transverse sectional view taken along the line 3-3 of FIG. 1 with the shield shown in its two extreme positions by dot-dash lines and in its intermediate position by solid lines;

FIG. 4 is a transverse sectional View taken along the line 44 of FIG. 2;

FIG. 5 is a longitudinal sectional view taken along the line 55 of FIG. 3 through the fastener discharge end of the tool;

FIG. 6 is a transverse sectional view taken along the line 6-6 of FIG. 5;

FIG. 7 is a sectional view taken along the line 7-7 of FIG. 4 through the shield;

FIG. 8 is a sectional view taken along the line 88 of FIG. 7 through the rubber-like block in the shield;

FIG. 9 is a perspective view of the shield removed from the remainder of the tool;

FIG. 10 is a sectional view of the tool in fastener driving position for attaching a strip to a room floor; while FIG. 11 is a sectional View of a carpet securing strip attached to a room floor with different thicknesses of carpet and spacing of the room side Wall from the strip shown by dot-dash lines and solid lines.

Before the tool and shield here illustrated is specifically described, it is to be understood that the invention here involved is not limited to the structural details or arrangement of parts here shown since tools or shields embodying the present invention may take various forms. It also is to be understood that the phraseology or terminology herein employed is for purposes of description and not of limitation since the scope of the present invention is denoted by the appended claims.

Those familiar with this art will recognize that the 3,l,l97 Patented Sept. 26, 1961 present invention may be applied in many ways and may be used with any suitable power actuated tool, but it has been chosen to illustrate the same in connection with a powder actuated fastener driving tool of the type disclosed in the copending US. patent application, Serial No. 590,274 entitled Tool, filed by Charles I. DeCaro, Robert W. Henning and Herbert L. Ivans on June 8, 1956. The present invention relates to the front end construction of such a powder actuated fastener driving tool and more especially to the shield located at such front end or fastener discharge end.

The illustrated construction is especially adapted for attaching a workpiece such as a carpet securing strip 13 to a support such as a room floor 11 in FIG. 11 adjacent the room side wall 12 at a predetermined spaced distance therefrom so that a laid carpet 15 may have its free end 15a downwardly tucked in this predetermined space A between strip 13 and room wall 12. Space A is determined by the thickness of carpet 15 so as to snugly receive the carpet edge 15a. For example, if the carpet is of the thickness shown by the dot-dash line representing its top surface, then the spacing would be B with the side wall shown by the dot-dash line in FIG. 11; the side Wall being moved nearer the strip 13 for simplicity of illustration while in reality the strip 13 is moved closer to the side wall 12.

Although the tool is illustrated as being used for attaching a strip 13 to a floor 11, the tool features may be used for the attachment of the projections of various workpieces, or the attachment of various projection-carrying workpieces, as will be readily understood from the present description of one embodiment of the invention.

The drawings illustrate a powder-actuated fastener driving tool 20 including a barrel 21, a tool member 22 having a hand grip 22a laterally extending therefrom, and a shield 24 for the fastener discharge end or muzzle of the tool. Tool member 22 has its right end or fastener discharge end in FIG. '1 adapted to be pressed by the tool operator toward the floor 11 or other suitable workpiece for placing the tool in proper position for driving the fastener into the floor because this tool member 22 is telescopically mounted over barrel 21 for relative movement with respect thereto and carries with it shield 24. This mode of operation is fully disclosed in the aforesaid copending U.S. patent application.

Shield 24 includes a sleeve portion 25 in FIG. 5 and a box-like member 26 either integrally formed together. or formed in two separate parts and then brazed, welded or otherwise secured together. This box-like member, located at the discharge end of the tool, includes a back wall 27 extending transversely to the direction of fastener drive and surrounding the discharge end of the tool and includes in FIG. 3 side walls 28, 29, 3t} and 31 integrally formed with the back wall, forwardly extending from the back wall with edges 28a, 29a, Istla and 31112 adapted to engage floor 11 during fastener driving. These side walls 28, 29, 3t) and 31 form a rectangle in a plane extending transverse to the direction of fastener drive, as shown in FIG. 3. These floor engagement edges have grooves 28!), 29b, 30b and 31b for accommodating strip 13 or any other projection whose attachment is to be effected by the use of the present tool.

The grooves in opposite side walls form pairs with grooves. 28b and 30b forming a first pair and grooves 29b and 31b forming a second pair. The grooves of any one pair will accommodate strip 13 during tool operation. Since two pairs are provided, they will alternately accommodate the strip at either of two degree positions relative to the shield with this strip located just inside of either of the two adjacent side walls 28 or 29. Since the strips are located so close to the side walls 28 and 29, the grooves 28b and 29b formed therein at the corner of these side walls may extend continuously as a single groove in both of the adjacent side walls in the manner shown in FIG. 9 to provide a simpler and more easily manufactured construction. Also, each groove has a tapered edge adjacent its floor engagement edge to permit easy mounting of the tool on strip 13 which is nearly the complete width of either groove of a given pair.

Means is provided for rotatably mounting shield 24 on tool member 22 coaxially with the fastener for a 90 degree arcuate movement between the dot-dash line positions in FIG. 3. Here this takes the form of a cylindrical bore in sleeve portion 25 telescoped over a cylindrical periphery on tool member 22 for rotation thereon and an arcuate slot 25a in sleeve portion 25 through which extends a screw 33 screwed into a threaded hole in tool member 22 and having its head captured in the slot. Slot 25a is of sufiicient arcuate length to permit 90 degree arcuate movement of the shield 24 so that either pair of grooves 28b, 30b or 29b, 311) may be used to receive the strip 13 in its attachment to floor 11. Hence, hand grip 22a may be conveniently positioned to extend away from the room wall 12 to avoid interference between the tool and the room wall. When it is desired to drive a fastener close to a corner of the room, it may be desirable to swing the shield 90 degrees from one dot-dash line position to another in FIG. 3 to reach in closer to the corner; this is the advantage of having two sets of grooves in the work-piece engagement edges of the shield. Also, when the tool is being used to drive the fastener into strip 13 at the corner of the room, the shield 24 may be swung to an intermediate position, such as the 45 degree position shown in solid lines in FIG. 3, so that hand grip 22a will extend away from the corner of the room at an angle of approximately 45 degrees with respect to the two corner-forming walls so that there is adequate room for the operators hands on the tool while each pair of grooves will be telescoped over a different strip 13 of the two strips right angularly arranged at the room corner.

Resilient means is provided for the releasable retention of strip 13 by shield 24. This takes the form in the present disclosure of a resilient block of rubber or other rubber-like material 35 secured to back Wall 27 of the box-like member by a rivet 36 and located in the corner formed by side walls 30 and 3 1. Hence, block 35 will effect the releasable retention of strip 13 by shield 24 as the result of telescoping movement of the shield over the strip. When the strip 13 is located in grooves 28b and 30b, block 35 will detachably urge it against side wall 29, and when it is located in grooves 29b and 311), block 35 will detachably urge it against side wall 28. Block 35 has teeth 35a or other suitable roughened surfaces in FIGS. 3 and 8 facing these side walls 28 and 29 for gripping the strip more securely. Both of these roughened or tooth-containing work surfaces have tapered entrance edges, as shown in FIGS. 3, and 7, so that the tool may be more easily telescoped over the strip 13.

Since it is desirable to adjust the spacing between room side wall 12 in FIG. 11 and strip 13 to accommodate different thicknesses of carpet 15, means for permitting adjustment of the spacing is provided. The shield includes two L-shaped spacer guides 48 and 49 with each having one leg 48a or 49a extending parallel to the back wall 27 of the box-like member in FIGS. 7 and 9 and having the other leg 4812 or 4% extending respectively one parallel to each of the side walls 28 and 29 and located outwardly therefrom. Although these guides are shown as two in number on two different side walls of the box-like member, it should be readily understood that a single L- shaped guide on one side wall will provide some of the advantages of this construction.

The leg 48b or 49b is adapted to abut against. the room wall 12 in the manner shown in FIG. to control the spacing between the room wall and the strip 13. This spacer guide 48 or 49 is mounted so as to permit adjustment of the spacing and also permit clamping the guide in the proper position to retain any desired spacing. Clamp means is provided for independently locking leg 48a or 4% of each guide to back wall 27 in clamped position but permitting independent relative approach or separation movement between the other leg 48b or 4% and its parallel side wall 28 or 29 in the unclamped position. Here, the spacer guide legs 48a and 49a have leg slots 48d and 49d extending along the length of this spacing movement with a screw 51 in each slot for clamping leg 43a or 49a to the back wall 27. Side walls 23 and 29 have slots 28d and 29d therein for receiving the uniform width legs 48a and 49a respectively. Screws 51 are screwed into threaded holes in extruded or punched up portions 27a in the back wall 27. Each screw 51 has a screw driver slotted head 51a to permit loosening or clamping so that each leg 48b or 49]) may be moved toward or away from its associated wall 28 or 29 to change the spacing and then clamping can be caused by tightening the screws. Since side wall slot 28d in FIG. 7 is spaced from screw 51 and slot 28d closely straddles the uniform width of leg 48a, spacer leg 4812 may be maintained closely parallel with its associated side wall 28.

Now it should be clearly apparent that during attaching of the carpet securing strip 13 to the floor 1-1 in FIGS. 10 and 11, a leg 48b or 4% of one of the spacer guides abutting against room wall 12 will control the spacing in the manner shown in FIG. 10 between the strip 13 and the adjacent room wall 12, and this spacing may be adjusted to the thickness of the carpet 15 to be laid so that the carpet edge 15a may be bent down into the spacing in the manner shown in FIG. 11 to give a finished appearance to the laid carpet. Therefore, generally speaking, both spacer guides 48 and 49 are extended the same distance from their associated side walls so that the spacing between the side wall and strip 13 will be the same regardless of whether the shield 24 is used in one or the other of the dot-dash line positions in FIG. 3.

This tool construction has numerous advantages. Resilient block 35 has three advantages. First, when the user finds it necessary to transport both the tool 20 and the strip 13 from one location to another, he may find it very inconvenient because he has only two hands andthe strip must be carefully balanced in one hand if it is to be carried satisfactorily. However, the strip may be snapped into one of the pairs of grooves 28b, 30b or 2%, 31b and retained in position by the resilient block 35 so that the resulting unit can be easily carried by the user having one hand on the tool grip 22a and the other hand supporting the strip 13 some distance from the tool. Second, space A in FIG. 11 between strip 13 and room wall 12 is accurately maintained because block 35 always resiliently pushes strip 13 up against shield side wall 28, for example, in FIG. 10 even though there may be variations in the width of different strips 13 or along the length of any given strip 13. Third, since block 35 is approximately down against the surface of the floor 11, it prevents spalling of the floor, especially when it is made of concrete, which might otherwise injure the tool operator. Having block 35 normally located between driven fastener 14 in FIG. 10 and the normal position of the tool operator will shield him from any spalling.

Having one leg 48a or 49a of each spacer guide extending through a side wall slot 28d or 29d instead of being located on the top or outside of the back wall 27 in FIG. 9 provides advantages. First, it presents a neater appearance. Second, the slots coact with the screws 51 to maintain the parallel relationship between legs 48b, 49b and side walls 28a, 2911 respectively without requiring addi tional screws or lugs coacting with slots 48d and 49d. Third, the lock action of screws. 51 is more fool-proof because the side wall slots prevent rotation of the L-shaped guides about the axes of the screws and because the screw driver slotted heads 51a of the screws 51 are located within the box-like member 26 of the shield so as to be protected by the shield walls 27, 28, 29, 30 and 31 surrounding the screw heads on three sides against accidental displacement or unauthorized loosening.

The shield also has a simplicity of construction wherein a multiplicity of additional features are provided for this simple construction. First, a single one-piece block 35 will resiliently grip strip 13 in either pair of grooves 28b, 3% or 29b, 31b. Second, grooves 28b and 29b in FIG. 9 are formed as one continuous groove for simplicity in manufacturing. This construction also permits the placement of the strip 13, in either pair of grooves, as close as possible to the room side wall 12 because strip 13 will abut against the inner surface of side wall 28 or 29.

Various changes in details and arrangement of parts can be made by one skilled in the art without departing from either the spirit of this invention or the scope of the appended claims.

What I claim is:

1. A shield for the fastener discharge end of a power actuated fastener driving tool, including a box-like member surrounding the discharge end of the tool and having side walls forwardly extending with edges adapted to engage a workpiece, said side walls forming a rectangle in a plane extending transverse to the direction of fastener drive, said workpiece engagement edges of all side walls having grooves for accommodating a projection on the workpiece at either of two 90 degree positions relative to said shield with the projection located just inside of either of two adjacent side walls, said grooves in said adjacent side walls being located at the corner formed by said adjacent side walls and extending continuously as a single groove into both said adjacent side walls.

2. In a power actuated fastener driving tool comprising a tool member having a fastener discharge end adapted to be pressed by hand toward a workpiece for driving a fastener into said workpiece and having a handgrip laterally extending therefrom, a shield, and means rotatably mounting said shield on said member coaxially with said fastener for 90 degree arcuate movement so that the handgrip may be turned to the most convenient 90 degree or intermediate position for tool usage; said shield including a box-like member surrounding the discharge end of the tool and having side walls forwardly extending with edges adapted to engage the workpiece, said side walls forming a rectangle in a plane extending transverse to the direction of fastener drive, said workpiece engagement edges of all side walls having grooves for accommodating a projection on the workpiece at either of two 90 degree positions relative to said shield with the projection located just inside of either of two adjacent side walls, said grooves in said adjacent side walls being located at the corner formed by said adjacent side walls and extending continuously as a single groove into both said adjacent side walls.

3. A shield for the fastener discharge end of a power actuated fastener driving tool, including a box-like member surrounding the discharge end of the tool and having side walls and a back wall, said side walls extending forwardly from said back wall with edges adapted to engage a workpiece having a projection adapted to extend up into said shield, and a resilient block of rubber-like material carried by said box-like member for yieldingly urging said projection against one of said side walls for the releasable retention of said projection by the shield as the result of telescoping of said shield over said projection, said block having a roughened surface facing said one side wall for gripping said projection more securely.

4. A shield for the fastener discharge end of a power actuated fastener driving tool, including a box-like member surrounding the discharge end of the tool and having side walls forwardly extending with edges adapted to engage a workpiece, said side walls forming a rectangle in a plane extending transverse to the direction of fastener drive, said workpiece engagement edges of all side walls having grooves for accommodating a projection on the workpiece at either of two 90 degree positions relative to said shield, and resilient means carried by said box-like member for the releasable retention of said projection by the shield in either position as the result of moving of said shield into contact with said workpiece.

5. A shield for the fastener discharge end of a power actuated fastener driving tool, including a box-like member surrounding the discharge end of the tool and having side walls and a back wall, said side walls extending forwardly from said back wall with edges adapted to engage a workpiece, said side walls forming a rectangle in a plane extending transverse to the direction of fastener drive, said workpiece engagement edges of all side walls having grooves for accommodating a projection on the workpiece at either of two degree positions relative to said shield with the projection located just inside of either of two adjacent side walls, said grooves in said adjacent side walls being located at the corner formed by said adjacent side walls and extending continuously as a single groove into both said adjacent side walls, and a resilient block of rubber-like material carried by said boxlike member in the corner formed by the sidewalls opposite said adjacent side walls for yieldingly urging said projection against one of its associated adjacent side walls for the releasable retention of said projection by the shield in either position as the result of telescoping of said shield over said projection, said block having roughened surfaces facing said adjacent side walls for gripping said projection more securely.

6. A shield for the fastener discharge end of a power actuated fastener driving tool, including a member having a back wall extending transverse to the direction of fastener drive and surrounding the discharge end of the tool and having side walls forwardly extending from said back wall with edges adapted to engage the workpiece, said side walls forming a rectangle in a plane extending transverse to the direction of fastener drive, two L- shaped spacer guides carried by said member with each having one leg extending parallel to said back wall and with the other legs of said spacer guides extending respectively one parallel to each of two side walls and located outwardly therefrom, said guides being effective to abut against adjoining structural walls associated with said workpiece so as to retain and thereby locate said member in a predetermined spaced relation thereto, and clamp means for independently locking said one leg of each guide to said back wall in clamped position, relative approach or separation movement between said other leg of each spacer guide and its parallel side wall being permitted when said spacer guide is in unclamped posi tion.

7. A shield for the fastener discharge end of an explosive actuated fastener driving tool for attaching carpet securing strips to a floor adjacent a room wall, said shield including a box-like member having a back wall extendin transverse to the direction of fastener drive at the discharge end of the tool and having side walls forwardly extending from said back wall with edges adapted to engage the floor, said floor engagement edges of opposite side walls having grooves for accommodating said strip to be attached to the floor, an L-shaped spacer guide mounted on said box-like member having one leg maintained substantially parallel to said back wall and the other leg extending parallel to a side wall connecting said opposite side walls and located outwardly therefrom, and clamp means including a sliding connection for locking said one leg to said back wall in any one of an enumerable number of clamped positions, relative approach or separation movement between said other leg and its parallel side wall being permitted when said spacer guide is in unclamped position, whereby during attaching said carpet securing strip to said floor said guide abutting said room wall will control the spacing between said strip and the adjacent room wall and this spacing may be adjusted to the thickness of the carpet to be laid so that the edge of said carpet may be bent down into 7 this spacing to give a finished appearance to the laid carpet adjacent the room wall.

8. A shield for the fastener discharge end of a power actuated fastener driving tool having a barrel bore for attaching carpet securing strips to a floor adjacent a room wall, including a box-like member having a back wall extending transverse to the direction of fastener drive and surrounding the discharge end of the tool and having side walls forwardly extending from said back wall with edges adapted to engage the floor, said side walls forming a rectangle in a plane extending transverse to the direction of fastener drive, an opening in said back wall adjacent the intersection of a pair of adjacent side walls for alignment with said bore, said floor engagement edges of opposite side walls having grooves for accommodating a strip to be attached to the floor at either of two 90 degree positions relative to said shield, said positions being alongside said adjacent walls, two L-shaped spacer guides with each having one leg extending parallel to said back wall and with the other legs of said spacer guides extending respectively one parallel to each of said adjacent side walls and located outwardly therefrom, and clamp means for independently locking said one leg of each guide to said back wall in clamped position, relative approach or separation movement between said other leg of each spacer guide and its parallel side wall being permitted when said spacer guide is in unclamped position, whereby during attaching said carpet securing strip to said floor one of said guides abutting said room wall will control the spacing between said strip and the adjacent room wall and this spacing may be adjusted to the thickness of the carpet to be laid so that the edge of said carpet may be bent down into this spacing to give a finished appearance to the laid carpet.

9. In a power actuated fastener driving tool for attaching carpet securing strips to a floor adjacent a room Wall and wherein said tool has a tool member having a fastener discharge end adapted to be pressed by hand toward the floor for driving a fastener into said floor and having a handgrip laterally extending therefrom, a shield, and means rotatably mounting said shield on said member coaxially with said fastener for 90 degree arcuate movement so that the handgrip may be turned to the most convenient 90 degree or intermediate position for tool usage; said shield including a box-like member having a back wall extending transverse to the direction of fastener drive and surrounding the discharge end of the tool and having side walls forwardly extending from said back wall with edges adapted to engage the floor, said side walls forming a rectangle in a plane extending transverse to the direction of fastener drive, said floor engagement edges of all side walls having grooves for accommodating a strip to be attached to the floor at either or two 90 degree positions relative to said shield with the strip located just inside either of two adjacent side walls, said grooves in said adjacent side walls being located at the corner formed by said side walls and extending continuously as a single groove into both said adjacent side walls, a resilient block of rubber-like material carried by said box-like member in the corner formed by the side walls opposite said adjacent side walls for yieldingly urging said strip against one of its associated adjacent side walls for the releasable retention of said strip by the shield in either position as the result of telescoping of said shield over said strip, said block having roughened surfaces facing said adjacent side walls for gripping said strip more securely, two l..-shaped spacer guides with each having one leg extending parallel to said back wall and with the other legs of said spacer guides extending respectively one parallel to each of said adjacent side walls and located outwardly therefrom, and clamp means for independently locking said one leg of each guide to said back wall in clamped position, relative approach or separation movement between said other leg of each spacer guide and its parallel side wall being permitted when said 8 spacer guide is in unclamped position, each of said adjacent side walls having a slot therein receiving a uniform width portion of its associated one leg, said clamp means including in each of said one legs a slot extending along the length of said uniform width portion and including in each leg slot a screw spaced from said side Wall slots for clamping its one leg to said back wall, whereby parallelism between each other leg and its associated side wall will be assured for any spacing therebetween, and whereby during attaching said carpet securing strip to said floor one of said guides abutting said room wall will control the spacing between said strip and the adjacent room wall and this spacing may be adjusted to the thickness of the carpet to be laid so that the edge of said car pet may be bent down into this spacing to give a finished appearance to the laid carpet.

10. A shield for the fastener discharge end of a power actuated driving tool, including a box-like member surrounding the discharge end of the tool and having side walls and a back wall, said side walls extending forwardly from said back wall around its periphery with edges of at least an opposing pair of said walls being adapted to engage a workpiece having a projection adapted to extend up into a receiving space of said shield, and a compressible body of resilient rubber-like material carried opposite an intervening one of said walls by said boxlike member beside said space, said body having a roughened, tapered edge forming a flaring entry for engagement with and detachably urging said projection against one of said side walls for the releasable retention of said projection by the shield as the result of telescoping of said shield over said projection.

11. A workpiece positioning and shield device, for the muzzle end of the barrel of an explosive powder actuated tool for propelling fasteners through the bore of said barrel and power driving them into said workpiece part of which is to be aligned with said bore at said end and has lateral edges, said device comprising a back wall member mounted on the tool to extend outwardly from said barrel displaced back of said end and at least a, pair of opposed jaw means spaced for clamping andshiel'ding en.- gagement directly with said workpiece between said pair, said means being carried by said member with forward extension therefrom and with displacement to a side of said barrel, to form with said member a receptacle for the reception and releasable frictional retention therein of at least part of said workpiece and wherein at least one of said means is a body of rubber-like material under spaced with respect to the width of said workpiece between said edges from the other and laterally compressible by both axially and laterally yieldable engagement with said workpiece whereby a yieldable entry is formed and said workpiece is retained by being urged against the other of said means as a result of axial movement of said tool until said means are in said direct engagement with said lateral workpiece edges.

12. A workpiece positioning and shield device for the muzzle end of the barrel of an explosive powder actuated tool for propelling fasteners through the bore of said barrel and power driving them into said workpiece part of which is to be aligned with said bore at said end and has lateral edges, said device comprising a back wall member mounted on the tool to extend outwardly from said barrel displaced back of said end and at least a pair of opposed jaw means spaced for clamping and shielding engagement directly with said workpiece between said pair, said means being carried by said member with forward extension therefrom and with displacement to a side of said barrel, to form with said member a receptacle for the reception and releasable frictional retention therein of at least part of said workpiece and wherein at least one of said means is a body of rubber-like material under spaced with respect to the width of said workpiece between said edges from the other and laterally compressible by both axially and laterally yieldable engagement with said workpiece whereby a yieldable entry is formed and said workpiece is retained by being urged against the other of said means as a result of axial movement of said tool until said means are in said direct engagement with said lateral workpiece edges, said body of rubbenlike material having a grooved surface defining teeth for improved reception and gripping of the workpiece.

References Cited in the file of this patent UNITED STATES PATENTS Dreilick July 10, 1928 Barron June 26, 1951 Farnsworth et a1. Aug. 18, 1953 Ballachey Apr. 6, 1954 Catlin Apr. 20, 1954 Henning et al. Sept. 17, 1957 

